REVIEWS 825 
The Petroleum Industry of Southeastern Illinois. By W.S. BLatcu- 
LEY. Bulletin No. 2, Illinois State Geological Survey. Pp. 109, 
5 plates. Urbana, IIl., 1906. 
The report discusses the history of the petroleum industry in Illinois, 
the oil-producing rocks and their structure, theories of origin, mode of 
occurrence, and production of oil in the state. There is also a description 
of the various oil and gas fields. C. W. W. 
The Composition and Character of Illinois Coals. By S. W. PARR. 
The Distribution of the Coal Beds of the State. By A. BEMENT. 
Tests of Illinois Coals under Steam Boilers. By L. P. BRECKEN- 
RIDGE. Bulletin No. 3, Illinois State Geological Survey, Pp. 
86. Urbana, Ill., 1906. 
Geology and Mineral Resources of Mississippi. By A. F. CRIDER. 
(Bulletin No. 283, U. S. Geological Survey. Pp. 99, 4 plates, 
including a colored geological map of the state.) Washington, 
Ds C:, 1906: 
Four Cretaceous, seven Tertiary, and two Quaternary formations are 
described, generally with especial reference to their economic possibilities. 
The mineral resources include clays (which furnish nine-tenths of the 
state’s income from mineral sources), ochre, glass-sand, cement rocks, and 
iron-ore. C2 WoW: 
Clays: Their Occurrence, Properties and Uses, with Especial Rejer- 
ence to Those of the United States. By HerrtnricH Ries. New 
York: John Wiley & Sons. London: Chapman & Hall, 
Limited. 1906, pp. 290, 44 plates. 
This book is a summary of our present knowledge of clays. It treats 
of the origin and the chemical and physical properties of clays, the kinds 
of clays, and the methods of mining and manufacture. The occurrences 
of clay are described by states, the clays of each geological period being 
treated separately. C. W. W. 
Igneous Rocks of the Eastern Townships of Quebec. By Joun A. 
Dresser. (Bulletin of the Geological Society of America, 
Wola op.497-522, Platesi07,.08:)sRochestem Ne Y= s1000) 
The rocks of southeastern Quebec present two petrographic provinces: 
I. (a) Porphyry-andesite series, extrusive and probably pre-Cambrian; 
